Why does a transformer (in physics, not the movie) work with an AC current in a primary coil, but not with a DC current?
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Explanation:
The fact that transformers are based on Faraday's law of induction makes it clear why we cannot use transformers to change DC voltages. If there is no change in primary voltage, there is no voltage induced in the secondary. One possibility is to connect DC to the primary coil through a switch.
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